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Recently, I had to restore my Prestigio tablet to its factory settings. I could not find exact instructions specific for that model that work stright forward, so I had to make guesses based on the information found on the net.

So, to make a hard reset on Prestigio 3870C_DUO, follow the steps below:

1. Power off the tablet by holding the power button for a few seconds.

2. Press the power and volume+ buttons simultaneously and hold them until the boot screen comes up.

3. Then release the power button, but keep holding volume+ for another 2-3 seconds. After releasing the volume+ button, the screen will go black for a few seconds and the android system recovery menu will appear.

4. Use volume+/- buttons to go through the menu options and select “wipe data/factory reset” using the power button.

5. Optionally, after step 4, you may wipe the cache and media partitions in the same way if you do not have important data stored there.

This again as in the previous Joomla branches is caused by the missing Joomla authentication plugin. The difference is that in Joomla 1.7 these plugins reside in the extensions table, rather than in the plugins table as in the previous versions.

To enable it, browse your Joomla 1.7 database via phpmyadmin, click on the extensions table and browse its content. Find the row with “plg_authentication_joomla” in the name column, change the value 0 to 1 in the column named “enabled” and hit the “Go” button to save the changes. After the plugin is enabled, the error message should be gone and you should be able to login with a valid login pair.

If you encounter the error “Cannot add or update a child row: a foreign key constraint fails” when you import a MySQL dump file, you can bypass the foreign key checks by setting the following line at the top of your MySQL dump file:

SET foreign_key_checks = 0;

Note that the line should be put before any other SQL query in the dump. Save the file and try to import it once again. This time it should be imported silently.

If you are proficient in the SQL, you might try and suggest other alternative solutions.

A short update:

The above solution might be rough and not well working. If you experience troubles and errors after the import, you can try to replace the above line with:

If you have Microsoft documents on your website and when try to access them you are prompted to open them as zip files, then you have probably not setup the correct content type for them in your Apache’s configuration. To fix the problem you have to add the following lines to your .htaccess or httpd.conf (if you have access to the global configuration):